Sharpener for pencils, crayons, and the like



C. HOLENSTEHN SHARPENER FOR PENCILS, CRAYONS, AND THE LIKE Dec. 8 1925- 1,565,149

Filed Db. 8. 1923 2 Sheets-Sheet 1 Dec. 8, 1925- 1,565,149

c. HOLENSTEHN SHARPENER FOR PENCILS, CRAYQNS, AND THE LIKE Filed D. 8. 1923 2 Sheets-Sheet 2 ti: Wha;

Patented Dec. 8, 1925.

unis!) STATES- CARL HOLENSTEIN, OF OERLIKON, SVTITZERLAND.

SHARPENER FOR PENGILS,

Application filed December To all who 1n it may concern:

Be it known that I, CARL Homms'rniN, a citizen of the Swiss Confederation. residing at Oerlikon, Switzerland, have invented certain new and uselt'ul In'lprovements in Sharpeners for Pencils, Crayons, and the like, for which I have filed an application for patent in Switzerland on the 13th December, 1922, and of which the following is a specitication.

This invention relates to a sharpener for pencils, crayons and the like comprisinga rotatable holder for the pencil arranged close to the sharpening tool. This holder has 5 movable clamping members. A. mechanism which rotates the holder acts upon the clamping members so that they grip the penoil to be sharpened before the mechanism rotates the holder.

The invention will be best understood from a consideration of the following detailed description taken in connection with the accompanying drawings forming a part of this specification, with the understanding that while on the drawings one embodiment of the invention is disclosed, the invention is not confined to any strict conformity with the showing of the drawings, but may be embodied in any manner which does not make a material departure from the salient features of the invention.

In the drawings Fig. 1 is a side elevation of the sharpener.

Fig. 2 is a top plan view with a receptacle for shavings attached.

Fig. 3 is an end view of Fig. 1 viewed from the left showing in broken lines a clamp clamping the device to a support.

Fig. l is a section on line A-B of Fig. 5.

Fig. 5 is a front elevation of the pencil holder.

Figs. 6 and 7 show the sharpening apparatus opened in two different positions.

Figs. 810 show constructional details.

Bow-shaped brackets 3 and 4 are fixed by means of screw bolts 2 on a bed plate 1. A yoke 5 is fixed on the lower surface of the base plate 1 by means of the screw bolts 2. The edge 6 of the base plate 1 has apertures 7 which permit, as shown in Fig. 3, to fix the apparatus with the aid of a screw clamp on a table 9. In the brackets 4 an axle 11 is journaled which is adapted to be rotated by means of the crank handle 10. On the inner end of axle 11 an unsupported coned cutter 12 is fixed which serves as sharpening tool CRAYONS, AND THE LIKE.

8, 1923. Serial No. 679,421.

and further a bevel wheel 13 which meshes with a pinion 14 on an axle 15. This axle 15 stands at an angle with regard to axle 11 and is journaled on the one hand at 16 in the bracket 4 and on the other hand at 17 in bracket 3. Arms 18 of sheet iron casing 19 are oscillably mounted around this axle 15. In the casing 19 a holder for the pencil 20 to be sharpened is arranged so that it is oscillable around the axle 15 which is parallel to its central line a". An angle lever 2% (Fig. adapted to pivot around a pivot pin 21 on bracket 3 carries on one of its arms a supporting roller 25 for the sheet iron casing 19. The other arm of the angle lever 24; is bent to form a bracket 26 for an adjusting screw 27 which loosely bears against a collar 22 of shaft 15, but might also be in contact with a flap of the bracket 3. The supporting roller 25 can be adjusted in Vertical direction with the aid of the adjusting screw 2'? in order to adjust the position of the central line a: (Fig. 3) of the holder with regard to the geometrical axis of the cutter 12. The spiral shaped part 23 of a spring surrounds loosely the part of axle 15 which is situated between the arms of the bracket 3. The end 24F of this spring presses the casing 19 with the holder against the supporting roller 25. The other end 28 ot the spring is in contact with a plate 29 loosely rotatable on the axle 15 and having a slit con-axial with the axle 15 and traversed by a clamping screw on the bracket 3. By oscillating the plate 29 from the position shown in Fig. 3 to the right and by securing the plate in this position by means of the clamping screw the pressure exerted by the part 24 of the spring upon the holder may be increased.

In the sheet iron casing which is not rotatable around the central bore 00 a sleeve 31 (Figs. 41. and 10) is rotatably mounted which is secured against axial displacement in the casing by screw pins 32 and by a collar The collar 33 has six axial apertures 34 (Figs. 6 and 7). By means of the screws 32 a ring 35 is further fixed to the rear end of sleeve 31, said ring having holes for the studs 36 of six lamellee 37 (Figs. l and 9). These lamellaa 37 are rotatably mounted by means of front journals 38 in a ring 39 fixed on the sleeve 31 by means of screws 40. The lainellae which are designed to serve as clamping members are thus oscillably suspended in the rotatable ill) sleeve. Their noses 41 grip loosely through the apertures 34 of the sleeve collar 33. A toothed .wheel 42 loosely mounted on the collar 33 has six notches 43 (Figs. 6, 7 and 8) designed to receive the noses .41 (Figs. 4, 6 and 7). The toothed wheel 42 is held on the one hand by parts of the noses 41 and on the other hand by the ring 89. A pinion 44 (Figs. 1 and 2) keyed on axle 15 meshes with this toothed wheel 42.

Supposethe 'lamellm be in the position shown in Fig. (3 a pencil or crayonor the like is inserted between the lamellee 37, which are in the open position, so that the point of the pencil rests on the cutter as shown in Figs. 1 and 2. lVhen the crank handle is rotated in the direction of the arrow shown in Fig. 2 the axle is rotated and with it the pinion 44 whereby the toothed wheel 42 is rotated in the direction of the arrowshown in F 6. Herefrom results that the notches 4-3 draw along the noses 41 ot the lamellee whereby the lamellae are oscillated around the studs 36 and 38 from the open position shown in Fig. 6 into the clamping position shown in Fig. 7 and the pencil is clamped. The sleeve 31 is rotated only when onfthe continuation of the'rotation of the crank handle 10 the toothed wheel 42 drawsv along this sleeve 31 through the intermediary of the lan'i-ellai 87 so that with the sleeve the pencil 2t) and also the cutter 12 are rotated. Before the holder with the pencil. is rotated the clamping members are first pressed against the pencil by the action 01 the driving mechanism. Owing to the oblique position of the cutter aisle with regard to the pencil the cut becomes hollow whereby the lead is laid free for a greater extent than usual. The toothed wheel 42 is the part of the driving mechanism which operates also the cutter 12. lVhen the pencil has been sharpened the lamellae 37 are brought to the position Fig.

6 by a short rotation of the crank handle in a direction opposite to that indicated by the arrow Fig. 2 so that the pencil 20 is released.

In order to make the sharp p ,int of crayon pencils somewhat blunt a small profile cutter is mounted on the axle 15 into which the sharp point is inserted whereupon by rotating the crank handle 10 this point is rounded oil.

I claim 1. A sharpener for pencils crayon pencils and the like comprising in con'ibination a sharpening tool, a holder for the pencil mounted so that it is adapted to oscillate around an axis parallel to its central line, a abutment for said holder, means for pressing said holder against said abutment, clamping members mov'ably mounted on said holder a driving mechanism designed i or rotating said holder. and means connecting said driving mechanism with said holder in such a manner that the clamping members are brought to the clamping position be tore the holder begins to rotate. I

2. A sharpener :lor pencils, crayon pencils and the like con'iprisin'g in combination a sharpening tool, a holder for the pencil mounted so that it is adapted to oscillate around an axis parallel to its central line, an abutment for said holder, a spring for pressin said holder against said abutment means for adjusting the tension of said spring, clamping men'ibers movably mounted on said holder, a driving mechanism designed for rotating said holder, and means connecting said driving mechanism with said holder in such a manner that the clamping members are brought to the clamping position before the holder begins to rotate.

In testimony whereof I aiiix my signa- 'ture.

CARL HOLENUPEIN 

